Fischer was renowned for his deep opening preparation and his ability to find novelties even in well-established lines. He contributed significantly to the understanding of various openings, particularly the Sicilian Defense.

Fischer possessed exceptional endgame skills, demonstrating a remarkable ability to convert even slight advantages into victories. His endgame play is often cited as a model for aspiring chess players.

Fischer was a vocal advocate for better tournament conditions, including higher prize money, improved lighting, and more comfortable playing environments. His demands helped to raise the standards for professional chess tournaments.

Fischer patents Fischer Random Chess (also known as Chess960), a variant of chess where the pieces on the first rank are randomly arranged (with certain constraints) at the start of the game. This variant aims to reduce the impact of opening preparation and emphasize creativity and strategic thinking.

Fischer's brilliance, charisma, and unconventional approach to chess continue to inspire players of all levels. His games are studied extensively, and his innovations have had a lasting impact on the way chess is played and understood.